There are currently no viruses for Mac OS X in public circulation, only a handful of trojans and other malware, which have to be installed manually via entering the administrator password.
The only anti-virus you need to protect your Mac is education and common sense.
Also know, that the term "virus" is often used to refer to other kinds of malware, but there are differences, which you can find out by reading the following: Mac Virus/Malware InfobyGGJstudios​

Of course it can see it, it is a partition on the drive in a format that Windows can read and write to. Just don't go mucking around with the system files on that drive and you will be fine.

As posted above, there are currently no viruses for mac, but if you are in Windows make sure that you have some type of virus software installed (Microsoft Security Essentials is good and free). This will protect your drives from malicious code.

I'm worried that an infected windows partition will start deleting files at random (It's happened to me before) or creating files until all my drives are full (It's happened to me before).

I've had lots of bad experiences with Windows and I don't my Mac to become an innocent bystander.

Click to expand...

Your Windows can't write to or touch files on the OS X partition, unless you intentionally give it the capability to do so, which isn't a trivial process. No Windows malware can hurt your Mac OS X partition because Windows can't write to HFS+ formatted drives.

Your Windows can't write to or touch files on the OS X partition, unless you intentionally give it the capability to do so, which isn't a trivial process. No Windows malware can hurt your Mac OS X partition because Windows can't write to HFS+ formatted drives.

Click to expand...

Doh, you are right! I totally forgot that I had a utility installed to let me read/write to it. Without something like that installed your partition is totally safe. I was using MacDrive by MediaFour.

I'm worried that an infected windows partition will start deleting files at random (It's happened to me before) or creating files until all my drives are full (It's happened to me before).

Click to expand...

Its 2011/2012 - 'prank' malware has been almost extinct for the better part of a decade. Few that exist are trojans, as nobody wants to waste exploits worth millions (particularly if they're zero-day) on mere pranks.

I find it handy having Windows being able to read my Mac partition (for example, transferring photos to edit - so much easier than transferring to a USB drive). But as has been mentioned, it's read only - Windows cannot write to the Mac partition at all.

I find it handy having Windows being able to read my Mac partition (for example, transferring photos to edit - so much easier than transferring to a USB drive). But as has been mentioned, it's read only - Windows cannot write to the Mac partition at all.

Click to expand...

Just installed 64 Bit Ultimate and it doesn't see it at all (it does see it in drive manager). I have used Mac Drive by Media Four for years and it has been great. If you want to read/write, this is a pretty good product.

My bad, it looks like a patch enables the drivers for HPFS. Still, it is read only. The software above can make it read/write.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.